openwrt/target/linux/ipq806x/patches-5.4/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch

--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -48,16 +48,71 @@ static int set_target(struct cpufreq_pol
 {
 	struct private_data *priv = policy->driver_data;
 	unsigned long freq = policy->freq_table[index].frequency;
+	struct clk *l2_clk = policy->l2_clk;
+	struct regulator *l2_regulator = policy->l2_regulator;
+	unsigned long l2_freq, target_l2_freq;
+	unsigned long l2_vol, target_l2_vol;
+	unsigned long target_freq;
 	int ret;
 
 	mutex_lock(&priv->lock);
 	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
 
 	if (!ret) {
+		if (policy->l2_rate_set) {
+			static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
+			int cpu, l2_index, tol = 0;
+
+			target_freq = freq * 1000;
+
+			krait_l2[policy->cpu] = target_freq;
+			for_each_present_cpu(cpu)
+				target_freq = max(target_freq, krait_l2[cpu]);
+
+			for (l2_index = 2; l2_index >= 0; l2_index--)
+				if (target_freq >= policy->l2_cpufreq[l2_index])
+					break;
+
+			l2_freq = clk_get_rate(l2_clk);
+			target_l2_freq = policy->l2_rate[l2_index];
+
+			if (l2_freq != target_l2_freq) {
+
+				/*
+				 * Set to idle bin if switching from normal to high bin 
+				 * or vice versa
+				 */
+				if ( (l2_index == 2 && l2_freq == policy->l2_rate[1]) ||
+					 (l2_index == 1 && l2_freq == policy->l2_rate[2]) ) {
+					ret = clk_set_rate(l2_clk, policy->l2_rate[0]);
+					if (ret)
+						goto exit;
+				}
+				/* scale l2 with the core */
+				ret = clk_set_rate(l2_clk, target_l2_freq);
+				if (ret)
+					goto exit;
+
+				if (policy->l2_volt_set) {
+
+					l2_vol = regulator_get_voltage(l2_regulator);
+					target_l2_vol = policy->l2_volt[l2_index];
+
+					if (l2_vol != target_l2_vol) {
+						tol = target_l2_vol * policy->l2_volt_tol / 100;
+						ret = regulator_set_voltage_tol(l2_regulator,target_l2_vol,tol);
+						if (ret)
+							goto exit;
+					}
+				}
+			}
+		}
 		priv->opp_freq = freq * 1000;
 		arch_set_freq_scale(policy->related_cpus, freq,
 				    policy->cpuinfo.max_freq);
 	}
+
+exit:
 	mutex_unlock(&priv->lock);
 
 	return ret;
@@ -200,6 +255,9 @@ static int cpufreq_init(struct cpufreq_p
 	bool fallback = false;
 	const char *name;
 	int ret;
+	struct device_node *np, *l2_np;
+	struct clk *l2_clk = NULL;
+	struct regulator *l2_regulator = NULL;
 
 	cpu_dev = get_cpu_device(policy->cpu);
 	if (!cpu_dev) {
@@ -307,6 +365,57 @@ static int cpufreq_init(struct cpufreq_p
 
 	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
 
+	policy->l2_rate_set = false;
+	policy->l2_volt_set = false;
+
+	l2_clk = clk_get(cpu_dev, "l2");
+	if (!IS_ERR(l2_clk))
+		policy->l2_clk = l2_clk;
+
+	l2_np = of_find_node_by_name(NULL, "qcom,l2");
+	if (l2_np) {
+		struct device_node *vdd;
+		np = of_node_get(priv->cpu_dev->of_node);
+
+		if (np)
+			of_property_read_u32(np, "voltage-tolerance", &policy->l2_volt_tol);
+
+		of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3);
+		if (policy->l2_rate[0] && policy->l2_rate[1] && policy->l2_rate[2]) {
+			policy->l2_rate_set = true;
+			of_property_read_u32_array(l2_np, "qcom,l2-cpufreq", policy->l2_cpufreq, 3);
+			of_property_read_u32_array(l2_np, "qcom,l2-volt", policy->l2_volt, 3);
+		} else
+			pr_warn("L2: failed to parse L2 rates\n");
+
+		if (!policy->l2_cpufreq[0] && !policy->l2_cpufreq[1] && 
+			!policy->l2_cpufreq[2] && policy->l2_rate_set) {
+			int i;
+
+			pr_warn("L2: failed to parse target cpu freq, using defaults\n");
+			for (i = 0; i < 3; i++)
+				policy->l2_cpufreq[i] = policy->l2_rate[i];
+		}
+
+		if (policy->l2_volt[0] && policy->l2_volt[1] && policy->l2_volt[2] &&
+			policy->l2_volt_tol && policy->l2_rate_set) {
+			vdd = of_parse_phandle(l2_np, "qcom,l2-supply", 0);
+
+			if (vdd) {
+				l2_regulator = devm_regulator_get(cpu_dev, vdd->name);
+				if (!IS_ERR(l2_regulator)) {
+					policy->l2_regulator = l2_regulator;
+					policy->l2_volt_set = true;
+				} else {
+					pr_warn("failed to get l2 supply\n");
+					l2_regulator = NULL;
+				}
+
+				of_node_put(vdd);
+			}
+		}
+	}
+
 	/* Support turbo/boost mode */
 	if (policy_has_boost_freq(policy)) {
 		/* This gets disabled by core on driver unregister */
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -72,7 +72,15 @@ struct cpufreq_policy {
 						should set cpufreq */
 	unsigned int		cpu;    /* cpu managing this policy, must be online */
 
-	struct clk		*clk;
+	struct clk			*clk;
+	struct clk			*l2_clk; /* L2 clock */
+	struct regulator	*l2_regulator; /* L2 supply */
+	unsigned int		l2_rate[3]; /* L2 bus clock rate */
+	bool				l2_rate_set;
+	unsigned int		l2_cpufreq[3]; /* L2 target CPU frequency */
+	unsigned int		l2_volt[3]; /* L2 voltage array */
+	bool				l2_volt_set;
+	unsigned int		l2_volt_tol; /* L2 voltage tolerance */
 	struct cpufreq_cpuinfo	cpuinfo;/* see above */
 
 	unsigned int		min;    /* in kHz */